<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
<form action="/login">
  username:<input type="text" name="username" id=""><br>
  password:<input type="password" name="password" id=""><br>
  <input type="submit">
</form>
<h3>数据库登录</h3>
<form action="/login_db">
  username:<input type="text" name="username" id=""><br>
  password:<input type="password" name="password" id=""><br>
  <input type="submit">
</form>
</body>
</html>